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(No Model.) 3 Sheets-Sheet 1. I

W. M. FULLER.

STEAM GENERATING FURNACE. No. 341,470. Patented May 11, 1886.

Juveflov? Willard dimer NV PETERs, PhnkoLilhugnphet, wnhingmn. D. c.

(No Model.) 3 SheetsSheet 2.

W. M. FULLER.

STEAM GENERATING FURNACE.

No. 341,470. Patented May 11 1886.

fie/ven or.

Willardeilllid'lez' 3 Sheets-Sheet 3.

(No Model.)

W. M. FULLER.

STEAM GENERATING FURNACE.

Patented May 11 UNITED STATES PATENT OFFICE.

\VILLARD M. FULLER, OF NEWV YORK, N. Y., ASSIGNOR OF ONE-HALF TOIVILLIAM A. PILE, OF SAME PLACE.

STEAM-GENERATING FURNACE.

SPECIFICATION forming part of Letters Patent No. 341,470, dated May11,1886.

Application filed January 8, 18%5. Renewed Oetober14, 1885. Serial No.179.898. (No model.)

To all whom it may concern:

Be it known that I, WILLARD M. FULLER, a citizen of the United States,residing at New York, in the county and State of New York, have inventednew and useful Improvements in SteamGenerating Furnaces, of which thefollowing is a specification.

My invention relates to steam-generating furnaces, and has for itsobject to provide means for the more perfect consumption of the productsof eombustion,such consumption taking place at a point where theincreased temperature shall be utilized in the increased heating powerof the furnace.

My invention consists in the several novel features of construction andcombinations of parts hereinafter fully set forth, and defined in theclaims annexed to this specification.

Referring to the drawings forming part of this application, Figure 1 isa cross-section of the furnace, taken through the fire-box. Fig. 2 is acentral longitudinal section. Fig. 3 is ahorizontal section taken in theplane 00 a", Fig. 2.

In the said drawings, the reference-numeral 1 denotes thesteam-generating boiler, which is, in essential respects, of the usualconstruc tion. This boiler is housed in suitable masonry, and .is heatedby a fire-box, 2, separated by a bridge-wall, 3, from a rearcombustion-chamber, 4. The construction and arrangement of these partsdoes not dilfer substantially from that already known and used.

Upon the bridgewall 3 I place a tank or box, 5, constructed of anymaterial which will withstand extreme heat. This tank is connected withaseries of air-pipes, 6, extending from end to end of the rearcombustion-chamber, 4. These pipes at their outer ends open into asupply branch, 7, through which air may be supplied to the entire seriesby means of a blower or other suitable apparatus.

From the tank 5, and communicating with it, a series of pipes, 8, extendover the fire chamber 2, said pipes being preferably of greater diameterand placed at greater intervals apart than the pipes 6. It will be seenthat these pipes 8 are arranged at some little distance above the grate2, and each is supplied with a quantity of perforations, 9, so

arranged that air entering said tubes will be sprayed into theincandescent blast or current of the burning products of combustionrising from the grate and passing over the bridgewall.

Upon the sides of the fire-chamber 2, above the grate, I arrangepipe-coils 10, the lower member of each coi-l being supplied by a pipe,11, with water from the boiler. The upper member of each coilcommunicates, by means of a drop-pipe, 12, with a tube, 13, arrangedjust above the air-pipes 8,and perforated upon the side adjacent to suchpipes with openings 14. It will be seen from Figs. 1 and 2 that thewater entering said coils is compelled to traverse its entire lengthbefore passing into the tubes 13. As each coil is exposed to the directheat of the furnace, the water is vaporized in traversing said coil, andthe steam is superheated when it reaches the tubes 13.

It is of the highest importance in this class of apparatus that the airand steam being sprayed upon the burning fuel in the fire-box shallreach a temperature of about 1,000 Fahrenheit, and for this purpose Iemploy the extended series of pipes 6, of comparatively small diameter,and laid as closely to each other as is consistent, with a free draftthrough the rear combustioirchamber. The coils 10 also vaporize thewater entering them and superheat the steam before its escape therefrom,and by using these devices I not only avoid any reduction of the heat ofthe combustionchamber, but obtain far better results than are possibleby the use of air and steam at lower temperatures. It is important thatthe air shall enter the firebox at some little distance above thegrate,where it mingles with the burning products of combustion, togetherwith the steam, furnishing sufficient oxygen to eifect the completeconsumption of the products of combustion.

This construction is applicable to all furnaces wherein a high degree ofheat is re quired.

\Vhat I claim is- 1. In a furnace, the combination, with thecombustion-chamber, of an air-tank mounted upon thebridge-wall, a seriesof pipes extending through the rear combustion-chamber and supplying airto the tank, a series of pipes ing at narrow intervals through the rearcon1- extending from the latter over the grate and bustion-chan1ber, 4,a series of larger pipes,

perforated, and pipe-coils arranged upon each 8, placed at Widerintervals over the grate,

side of the combustion-chamber and receivand the coils 10, having theirlower members 15 5 ing water from the boiler, the lower memberperforated, substantially as described.

of each coil being perforated, substantially as In testimony whereof Iaflix my signature in described. presence of two witnesses.

2. I11 a furnace, the combination, with the XVILLARD M. FULLER.fire-chamber 2, having a grate, 2*, of the air- \Vitnesses: to tank 5,mounted on the bridge-wall 3, a series EDWARD E. ,WADLEIG-H,

ofair-supply pipes, 6, of small diameter extend- BENJ. A. SHELDON.

